The evolution of a driverless car – The Valeo driverless parking is initiated with an iPhone app. The car is equipped with 12 ultrasonic sensors, six in the back and six in the front, a laser scanner mounted in the grille, and four cameras.

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Evolution of the driverless car11 photos

The evolution of a driverless car – An electric driverless car called Citymobil was introduced in French town of La Rochelle in 2011 as part of a program aiming at reducing both traffic and pollution.

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Evolution of the driverless car11 photos

The evolution of a driverless car – This autonomous Audi TTS Pikes Peak was unveiled in 2010. The vehicle features a pair of trunk-located computers that allow it to drive on the outer edges of its speed and handling limits without a driver.

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Evolution of the driverless car11 photos

The evolution of a driverless car – This driverless vehicle, shown in 2009, is part of a 21-strong fleet operating at London Heathrow Airport. The pod can carry four passengers with their luggage and can travel at up to 25 mph.

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The evolution of a driverless car – "The Boss," a driverless automobile, won the prestigious DARPA Urban Challenge, a competition by the U.S. Defense Department, in 2007.

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Evolution of the driverless car11 photos

The evolution of a driverless car – Another DARPA Urban Challenge driverless car, the Volkswagen Passat 2.0 TDI, is showcased at the Science Museum in London in 2007. The car is guided by a system of laser sensors and computers.

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Story highlights

Google has unveiled its own version of a driverless car with no steering wheel and pedals

The vehicle can go at maximum speed of 25 mph and can carry two people, the company says

Google says it would build around 100 prototypes and start testing them this summer

Google has revealed a prototype of its latest driverless car -- and this one doesn't even have a steering wheel.

The car will only have a stop and go button. No steering wheel. No pedals.

Unlike Google's previous self-driving vehicles, which have been based on conventional cars adapted to navigate around without a driver, this model has been designed from scratch.

"They won't have a steering wheel, accelerator pedal, or brake pedal... because they don't need them," Google said in a statement.

The car can carry two passengers and has a maximum speed of 25 miles per hour.

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"They have sensors that remove blind spots, and they can detect objects out to a distance of more than two football fields in all directions, which is especially helpful on busy streets with lots of intersections," the company said.

With its front designed to look like a friendly smiley face, the Google autonomous car is not just efficient and futuristic, but also cute to look at.

Google said it planned to build around 100 prototypes, which it will start testing in a few months.

The company started developing its self-driving cars in 2005, and is testing previous models across the U.S. They are expected to be available to buy by 2020.